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Income Taxes - Summary of Components of Income Tax Expense (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Mar. 31, 2018
INR (₨)
Current taxes        
Domestic ₨ 18,437   ₨ 17,987 ₨ 18,500
Foreign 5,887   5,663 7,834
Current taxes 24,324   23,650 26,334
Deferred taxes        
Domestic 1,624   (180) 3
Foreign (1,149)   1,772 (3,947)
Deferred taxes 475   1,592 (3,944)
Income tax expense ₨ 24,799 $ 329 ₨ 25,242 ₨ 22,390